Quarter Billions of US Dollars 2010-07-01 0.500 2010-10-01 0.500 2011-01-01 0.500 2011-04-01 0.500 2011-07-01 0.500 2011-10-01 0.500 2012-01-01 0.500 2012-04-01 0.500 2012-07-01 0.975 2012-10-01 0.975 2013-01-01 0.975 2013-04-01 0.975 2013-07-01 1.725 2013-10-01 1.725 2014-01-01 1.725 2014-04-01 1.725 2014-07-01 1.725 2014-10-01 1.725 2015-01-01 1.725 2015-04-01 1.725